Vehicle lifting-jack.



` W. F. RADKE & F. WENTZLAFF.

VEHICLE LIFTlNG JACK.

APPLICATION FILED APILZQ, I9I5.

1,288,187, Patented Dec.17,1918.

, UNITED sTATEsFATENr OFFICE.

WALTER F. RADKE AND FREDERICK WENTZLAFF, 0F ERoWN DEER, WISCONSIN. y

VEHICLE LIFTING-JACK.

Specification of Lettersfatent. l

Patented Dec. 17, 1918.

Application med Aprnzs, 1915'. seiaalNo.24,642.k

To all whom t may concern:

Be it known that we, WALTER F. RADKE and FREDERICK WENTZLAFF, citizens of the United States, residing at Brown Deer,

ncounty of Milwaukee, and State of Wisconsin, have inventedy new and useful Improve-y ments in Vehicle Lifting-Jacks, of which the following is a specification. Our invention relates to improvements in lifting jacks for motor driven vehicles.

'Ihe object of our invention is to provide `a form of jack which can be operated autoy. In the drawings'- Figure r1 is a side elevation jack embodying our invention.

Fig. 2 is a plan view of the same. Like partsare identified by the same ref- "erence characters throughout both views.

\ A base frame including a set of parallel side bars A and a buffer blockB isadapted to rest upon the floor with the side bars A rparallel to the line of movement of thevehicle, the barsA being in sufficient proximity to permit the vehicle wheels to pass along the sides of the rframe without strikking it. At the rear end, the basev frame is provided with a cross bar A and raised "blocks a, the latter being mounted on the side bar A. l

A liftingframe comprisesa pair of side bars D connected by Cross bars D at its respective ends. Near 'the front end of the lifting frame, the side bars Dare provided with upwardly extending shouldered proj ecf tions d against which thek frontv axle of a vehicle may impinge. rThe front ends of the frameare alsosupported from the floor by wheels E and bolster posts F connected A with the'axle shaft yE of the wheels. The bolsterpostsF are connected with the lifting frame by link rods F. Near therear end of the lifting frame, a set of links G connect the side bars D of the lifting frame with the base frame side bars A, these links being pivoted to thek lifting frame andkbase frame by pivot bolts g, g respectively.y kAt 'i the front end ofthe lifting frame a latch member H- is pivotally connected therewith, the same being preferably pivoted to the of a lifting bolster posts F at L, whereby the latch member II may swing upwardly or downwardly.

At its front end the latch member H has a hook shaped Adownwardly projecting lip L, whichkis adapted to engage the frontend vof a catch plate I secured to the buffer block i B. Achain J is secured to the front end n of 'the latchH and extends tol a raised lever K with an operating rope J" hanging within k,reach of a person standing on the floor, `whereby when the latch H i thek position illustrated in Fig. l withfthe rear end of the lifting frame depressed and` also assuming that the shouldered projections d are in position to engage the front 7o In operation, assuming the parts to be in aXleof' amotor driven vehicle, it is then merely necessary to drive the motor driven vehlcle over the-lifting jack until the front axle engages the projections d, whereupon the momentum pressure of the vehicle will be transmitted to thelifting frame causing the iwhcels E to movel forwardly in the direction of the buffer block B until the latch II engages over the front end of the catch plate I. In the meantime the links G will swing toward a vertical position, there-'i4 by lifting the rear end. ofthe vlifting frame until the rear ends of the bar D engage and lift the rear axle of the vehicle. Owing to the fact that the projections Z are located in the rear 0f thel bolster posts Fand owing also tothe fact that these bolster posts are slightlyk inclined when the jack is in the lowered position illustratedin Fig. l, it. is obvious that when links G swing toward .the vertical position, ihe posts F will also swing toward the vertical position and the bars D willbe suiiiciently lifted adjacent to ythe projections d to raise .the front axle of the 'vehicle until all four of the vehicle wheels are raised above the floor. The latch" `I-I having engaged catch I, it is obvious that the vehicle will not be released until a pull upon the chain J releases latch I-I from the catch', whereupon the lifting frame may swing rearwardly and downwardly to the" posit-fou illustrated in F ig. 1, with the rear end poriions'of the bars Fresting upon the proJections a of the base frame.

` In order that ,this jack may be utilized` for vehicles ofl'diil'erent sizeswith reference t0 the height of the of auxiliary lifting .ban *members L and iLz,

which may be ,applied to the side bars D of*` the lifting frame and secured theretolbyfff depending' arms Z which engagey suitablebrackets Zv carriedV by said bars -`Thef auxiliary members L- areeach provided with a stop projection M corresponding withthe stop projections j/Zon the 4side barsD, .said

projectionsM1` receiving the pressure Aof the Member .L is` of fcourse-.-raisedg on fits .under surface j toreceive .a,projectionl Z, the latterwthen serving to relieve the -arms' Z .front axleof l,the `higher Vehicle.'`

ets Z fromstrain. n The reary auxiliary. mem# bers 'Lf are alsousecuredto the?` main"`liftf ngfframe by arms.. Z'slisaeingtr brackets Z..f, No further interlocking,engagement is required for these members-sincethe rear. .axlevdoes not/come in contactwwith themr ,until they. swingiip against itand liftit. Owingtc the lengthof ythe auxiliary KVmemi bers l. and owing to thefactithaty the side bars i.' are adaptedto engage therear, axle j of a vehicylejat any point along theirlength;

it isobvious that thislifting jack can be used for vehiclesof differing-length `regardless .ofthe distance between the axles.4k

The linksr G yare preferably so formed and connected with the side bars D .of` thai-lifting frame that they; will nothave reached ai vertical position when the wheels Strikelthe fbuffeabioek B, and Owing a aerea that p their upp er that the axle engaging Ving frame are adapted l kthe vehiclepat, any point'-along their length. Y Alsoto the fact f which the front axle impinges are rigidly the entire vehiclefmay they arev slightly incl'ned rearwardly at Y ends when inthe raised-'or lifting position,`r iti'sobvious that thegjackwil'l automaticallyV` return to the releasing position under therweght of the vehiclel as'A soon as the latch H isreleased We attach great 'import members of fthev liftthat theprojections against connected with the liftin frame upon ywhich fthe liftingframe is in the raised position.

. connected All parts of the lifting frame beingv lrigidly with each other', it is obvious that theentire taneously performed bility of anyk portion thereof twisting tout; of

shape j or failingto properly yengage the axlek This .form of yconstruction V of' the vehicle.

enables us to use the auxiliary membersL,

LQwhich may be made insets of different u heights corresponding with any.; andzfadapted kto be interchangeably usedffinfaccordance with 4the* requirements ofr thje".`vehiclejto "be lifted. j. .f

To avoid marring7 they painton the yunder surfaces,` ofthe vehiclefa'xles we preferably employ slidesO whichmay rest loosely lon. l

axle, we employ ai'setl.willbei"actuated as'above described., andthegbrak* L l.yA.-;vehcle liftingU jack. in which ythe from. the: catch` I.l

forward c, jbepiishedfforwardly, and thevehicle lifted bythe links, as thelatterswing from rearwardly inclined positions toward ya vertical to engage the axle of e ysupported when lifting, operation fwillf be 'A simuland there `is lno, possiuppersurface's ofthebars D with flanges Pengaging thev sides of such bars. These slides may. be .so .adjusted with reference to thestops d that they will move forwardly iinderftle'pressure of the axle. YThe bars D will preferably be formed ofangle iron upon whifcliftheslides O can 4move withsufcient v.freedoim` Itisnot necessary that the front uaxle `shall' come into actual contact with the stops d, since itisobviousthat as soon as sufficienti pressure is exerted upon .the slides O E-tofcause` the lifting frame` to move in the direction ofg'the .buffer 1B, the lifting frame Vteclaimi f vehicle is automaticallyflifted by its own `momentum .in moving intov position upon the jacl'rf, includingthe combinationwith a fixed base: having; afsubstantiallyl horizontal surfaceyin:combination witha` lifting frame provided withside bars, a set ofsupporting wheels fon the front vend thereof,l adapted to hold the: front. end portions' ofthe side bars with axle engaging surfaces normally'. at an elevation substantially the samexas that of thefrontaxle of thevehicle to belifted,` a yset of links pivotally connecting they rear en dsjofthe.` frame with the base, and uadapted to' swing upwardly. and. forwardly, a` set ,of

axle engaging fstops carried `by the frame, in the rear Offa kplane extending, at right angles to fthe: frame.'7 andincluding. the axesI of the f. supporting wheelsfand another set of stops supported ongthebasein position to arrest thel forward lmovement of thel wheels kwhen .thellinks haye swung from rearwardly infclinled..k .positions substantiallyy tovertically disposed positions,gwhereby y l when saidaxle stops are engaged' bythe axleof a y movingvehicle, the wheels will plane. i

ingside bars of suflicientlength toengage both vthe front and rear axles of vehicles of i' differing length. n I 3.1A vehicle lifting jack, `including the combination with' a lifting frame provided ran axle engaging kprojection near its lj'frontend and j ya e link pivotally connected vj-with thebaSeY at its rearend,' meansA for utilizing thelpushingl pressureoflsuch axle to plosc'illate tsaidllinl and raise the lifting framey to aveliicle supporting position, said lifting frame having side bars of suflicient length to engage both the front and rear axles of vehicles of differing length, a gravity actuated latch connected with the lifting frame to 'lock the same in raised position, and means formanually releasing said latch;

4:. A vehicle lifting jack including the combination with a base frame, of a lifting frame, links pivoted to the base frame and pivotally connected with the rear end portion of the lifting frame in the rear of the base frame connection, wheels supporting the front end 0f the lifting frame in a posi-y tion to receive the front axle of the vehicle, and stops on the lifting frame against which such axle may strike; the side bar o-f the lifting frame being of sufficient length to engage both axles of the vehicle regardless of variations in the distance between such axles, together with a set of buffer blocks against which saidv wheels may strike; and a latch to lock the lifting frame in a raised position, with said links extending upwardly and slightly rearwardly whereby, when the latch is released, the lifting frame may swing backwardly and downwardly at its e rear end to lower and release the vehicle.

vehicle supporting position, said lifting frame having side bars of sufficient length to engage both the front and rear axles of vehicles of differing length.

' Intestilnonywhereof we alix our signatures in the presence of two witnesses.

, WALTER F. RADKE. t v yFREDERICK Witnesses: y 4

LEVERETT C?. WHEELER, IRMA D. BREMER.

Copies of this patent may he obtained for ive cents each, by addressing the llommissionerk o1 Patents, Washington, D. G." 

